When I first saw the picture of this Astor Studios Hawaiian Guitar my immediate though was, "That's a short neck! Joins the body at what? The tenth fret?"
Then I realised that it was a hawaiian guitar and would be played lap-style. Nevertheless it's a peculiar looking instrument. It looks almost as if you could use it as a small boat or coracle. Its shape also reminds me of the now legendary wheelbarrow bass.
The seller estimates that it might date back to the 1930s or 1940s. What appears to be a dull grey finish in the photo, is actually a green marble.